Mon, 30 Nov 2020 11:16:41 +0200 Oleksandr Gavenko Added new articles and few fixes.
Fri, 20 Nov 2020 22:56:03 +0200 Oleksandr Gavenko Added fixed and mew new articles.
Sat, 14 Nov 2020 16:29:08 +0200 Oleksandr Gavenko Added most of the chemical elements.
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